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https://issues.apache.org/jira/browse/FLINK-27251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536102#comment-17536102
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fanrui commented on FLINK-27251:
--------------------------------
Thanks for your suggestions.
Re 4, your are right. There is one {{ChannelStateWriteRequestExecutor}} per
each subtask and each instance has it's own one single thread. But I don't
understand "when that thread is blocked by the timeout, it's queue of requests
should be completely empty.", could your share more details? Which thread? Is
the ChannelStateWriteThread?
For the aborting checkpoint, I will improve it.
I agree with you, this feature is clear, and don't need a new FLIP.
> Timeout aligned to unaligned checkpoint barrier in the output buffers of an
> upstream subtask
> --------------------------------------------------------------------------------------------
>
> Key: FLINK-27251
> URL: https://issues.apache.org/jira/browse/FLINK-27251
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Checkpointing
> Affects Versions: 1.14.0, 1.15.0
> Reporter: fanrui
> Assignee: fanrui
> Priority: Major
> Fix For: 1.16.0
>
>
> After FLINK-23041, the downstream task can be switched UC when {_}currentTime
> - triggerTime > timeout{_}. But the downstream task still needs wait for all
> barriers of upstream.
> If the back pressure is serve, the downstream task cannot receive all barrier
> within CP timeout, causes CP to fail.
>
> Can we support upstream Task switching from Aligned to UC? It means that when
> the barrier cannot be sent from the output buffer to the downstream task
> within the
> [execution.checkpointing.aligned-checkpoint-timeout|https://nightlies.apache.org/flink/flink-docs-release-1.14/docs/deployment/config/#execution-checkpointing-aligned-checkpoint-timeout],
> the upstream task switches to UC and takes a snapshot of the data before the
> barrier in the output buffer.
>
> Hi [~akalashnikov] , please help take a look in your free time, thanks a lot.
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